What happened
During a flight at approximately 1000 feet above ground level, the certified flight instructor (CFI) initiated a simulation of an engine failure. When the throttle was advanced in an attempt to recover power, the engine did not respond as expected. Consequently, the CFI executed a forced landing in a plowed field. The aircraft nosed over upon impact with the soft, furrowed dirt surface.
The investigation
A post-accident examination of the aircraft revealed no mechanical issues with the engine that would have caused an actual failure during normal operation. However, the inspection did identify specific maintenance concerns. The number one cylinder exhibited low compression, which was attributed to frozen piston rings. Additionally, the spark plugs showed indications of burning oil, suggesting potential lubrication or sealing issues within the engine.
Findings
The primary factor in this incident was the decision to simulate an engine failure at a low altitude. While the simulation itself was the intended training maneuver, the subsequent forced landing resulted in damage to the aircraft due to the terrain conditions. The mechanical findings regarding the number one cylinder and spark plugs indicate underlying maintenance needs but were not the direct cause of the simulated failure event.
Safety message
Pilots should ensure that simulated engine failures are conducted at altitudes sufficient to allow for a safe recovery or landing in suitable terrain. Regular maintenance checks are essential to identify issues such as low compression or oil burning before they affect performance.